Driving and stopping mechanism



I. KIEWICZ.

nmvme AND STOPPING MECHANISM.

APPLICATION FILED JUNE [4, I919.

1 ,344, 34 5. Patented June 22, 1920.

2 SHEETS-SHEET I.

\nvenTor. dohn Kiewicg Aflys.

l. KIEWICZ. DRWING AND STOPPING MECHANISM.

APPLICATION HLED JUNE 14. 1919. 1,344, June 22, v Z SHEET$SNEET 2- Fig.2.

I s 42 |nvenTor. 5 John Kiew'mg byMMA M Afiys.

UNITED STATES rtur OFFICE.

JOHN KIEWICZ, 0F BOSTON, MASSACHUSETTS, ASSIGNOR TO THE BEECE BUTTON HOLE MACHINE COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MAINE.

DRIVING Ann STOPPING MECHANISM.

Specification of Letters Patent.

Patented J one 22, 1920.

To all whom it may concern:

lie it known that 1, JOHN Kinwiez, citizen of the United States, residing at Boston, county ol' Suii olk. State of Massachusetts, have invented en Improvement in Driving and Stopping Mechanism, of which the following description, in connection with the acconnmnying drawing, is a. specificittio'n. like characters on the drawing, representing like parts.

This invention relates to driving and stopping mechanism which is especially designed ior use in connection with a bnttonhole sew ing muchine and has for its object to improve the driving and stopping mechanism il l ustrnted in my co-pending application Se. No. 207%35, filed December 15 1917, by providing means whereby it may e more easily manually operated.

In order to give an understanding of my invention, I have illustrated in the drawingrs a selected embodiment thereof which will now be described, after which the novel. features will be pointed out in the appended claim.

In the drawings. Figure 1 is n side view of a butto nhole sewing machine halving in y improvements applied thereto;

Fig. 2 is u to p plan view of the driving and stopping mechanism embodying my lIllpro'vcments Fig. 3 is a detaii view.

The driving and stopping mechanism illustrated in my above-mentioned application is shown therein as applied to a, button hole sewing machine, and it is constructed to bring the sewing machine to rest ht the completion of the lrmttonhoha and to lock the driving shaft for the stitch lumni-n51 mechanism in its position of In the operation of a huttonho'le sewing machine it frequently happens that after a machine has been troi-ight to rest, the operalter desires to turn the driving shaft for the stitch-forming mechanism slightly by hand in order to bring the needles into a convenient position for threading them or for adjusting them, and to do this involves the manual manipulation of a controlling membe! for the stoppin and driving device for the purpose oi releasing the stop device sufficiently to permit the driving shaft to be turned manually. --The purpose of my present invention is to provide it novel means by which this manual release of the stop device will be facilitated.

in the drawings 1 indicates generally the frame 01? u. buttonhole sewing machine which supports stitr-lrl'ormiug mechanism comprising an upper reciprocating eye pointed needle 3 and an under thrcnd mecluo nism indicated generally at 4 and which usunlly is provided with an under needle that cooperates with the needle 23 to com-ate hate the stitches. This stitch-forming: mech anism is actuated from n drivilre shail't 2 Tim usual in buttonhole sieving machines. and said shaft is actuated from a. driving pol icy (5 which is loosely mounted thereoin but which is adapted to be clutched thereto by a suitable clutch that is controlled by .L cone-shaped clutch'ectunting member 13 that is slidably mounted on the shaft. This clutclmtchuating member 13 is controlled by an arm '14 which extends from a sleeve 32 that slidzibly mounted on a, crmtrolling member 22 said member being in the form of a rod extending parallel to the shni't .3 and slidzibly mounted in suitable bearings carried by the machine i'rnmc. liloveinent "of the sleeve 32 and arm 14 toward the top of Fig. 2 will cause the conc-shnped clntclr actuating member 13 to actuate the clutch by which the pulley 6 is clutched to the driving sh-(tit 2 and movement of the sleeve into the position shown in Fig. 2 will release the chitch. all as illustrated in my said (we-pending application.

For stopping the shaft when the clutch is released. the shaft 2 has fast thereon a? stop ram 17 which o-operates with a stop member 2 yieldingly carried by an arm 21 that inst on the controll'iim member 22. The stop cam is formed with the eccentric or calm surface 18 end with the stop notch 19 into which the stop members 20 is received when the machine is at rest.

In order to start the machine in operation, the controller 522 is moved toward the top of Fig. 2 thereby shifting the stop member 20 laterally out of the notch 19 and freeing the stop cam. The controller 22 is connected to the sleeve 32 by means of a. springs; 33 so that this releasing! movement of the controlling member 22 is communicated to the sleeve 32 thereby to throw the clutch into opera-- tion. When the controller 32 is moved toward the bottom of Fig. 2, the collar 88 on the controller engages the sleeve 32 thereby releasing the clutch, and this movement oi the controller also brings the stop member 2 into position to engage the stop cam 17. The engagement. of the eccentric portion 18 of said stop cam with the stop member 20 serves to swing the arm 21 dowmvarilly thereby al'iplying the brake arm 71 to the brake surface 72 and retarding the rotation oi the shaft .2. and when the notch '11) is carried around opposite the stop member 20, the arm 21 moves u 'nvardly by the action oi the spring 28 and the stop member enters said notch, thus positively bringing the shaft to rest and locking it in its position of rest. This upward movement of the arm releases the brake.

3t) indicates a. latch which is pivotally connected to the sleeve it! and adapted to engage a shoulder or abutment as formed on the frame 1 when the clutch is diseu gaged. This latch is For the purpose ol' holding the clutch disengaged when the coir troller 22 is moved into a position to release the stop cam, and for mi'iilitaining said clutch disengaged until the stop cam is fully released, at which time the latch 36 is re leased thereby allowing the clutch to be thrown into operation by the action of the spring 33. The construction and operation of this latch 36 is described in detail in my (to-pending application to which reference may he had.

The device shown in my said co-pending application comprises an arrangement by which the controller 22 is automatically controlled from the main feed earn .1 by which the work is fed and by which other operations'ot the sewing machine are controlled, as usual in buttonlu'ile sewing machines of this type. For this purpose an elhovv lever 41 is provided which is pivoted at 420 to the frame 1 and one arm of which is provided with a notch 81 adapted to receive a. pin 30 on a collar 31 fast to the controller 22. The other arm of said elbow-lever 41 is provided with a notch in which is received the end 42 of a lever 43 that is pivoted to the frame at 44. This lever is actuated by a pin or plunger 45 that operates through the bed plate of the frame 1 and which is controlled by the cam 5. For this purpose said cam is formed with a groove 82 therein having the cam surface 46 at one end thereof. When the sewing machine is at rest, the cam groove 82 is heneath the pin 45 and the latter occupies said groove. When the sewing machine is started, the first operation thereof is to clamp the work and actuate the buttonhole cutter for cuttin the buttonhole, this occurring while t e shaft 2 is locked in its position. of rest by the stop mechanism. During the preliminary operation of cutting the huttonhole the cam 5 is moved thereby to bring the inclined surface "16 under the pin 4-5, thus raising the pin and causing it to engage the lever 43 and turn the latter. This turning move ment of the latter will depress the end 42 ot' the lever 43, thus rocking theelbow-lever "1 1 and moving the controller 22 in the lirection of the arrow, Fig. 3, which is toward the top of Fig 2. This movement of the controller removes the stop 211 from eugagt ment with the stop ram 17, and as soon as the latch 1H3 is tripped the sleeve 32 is moved to clutch the pulley 6 to the shaft, thus setting the stitch-forming mechanism in operation. While the stitching on the buttonhole is done the pin 45 is riding over the high portion 61 of the cam ti and at the completion of the stitching on the buttoir hole the cam f has made a complete rotation and the pin -15 drops into the slot 82 again, thu allowing the stop motion to act. to stop the machine.

The construction thus far described is set forth in greater detail in my above-men tioned application.

In operating a sewing machine it frequently happens that the operator desires to turn the driving shaft 2 slightly when the machine is at rest in order to raise or lower the needles either for the purpose of threading the needle or for making some adjustment therein, or for some other purpose. This involves manually shifting the controlling member 22 in the direction of its length to release the stop member from the stop cam, and then manually turning the shaft 2 by means of the knurled head 65 thereon. he stop member is manually re leased by the operator pressing inwardly on the end 63 of the controller.

To eflect the release of the stop cam often requires considerable effort on the part of the operator, and if she is seated in front of the machine, as she usually is, the effort required is such as to necessitate her rising from her seat in order to get into a better position to manually operate the controller. In order to facilitate this operation, I have provided a novel device which can be readily reached by the operator and actuated without the necessity of rising from the seat. This device is in the form of an L-shaped lever 57 pivoted to the machine at 58, said lever having one long arm extending in a vertical direction and having a shorter. arm 59 extendin forwardly from the pivot and then lateral y, as shown at 56, the portion 56 overlying the end 55 of the elbow-lever 41. The lever 57 is acted upon b a. spring-53 which tends normally to hol it inthe position. shown in Fig. 1.. When the lever 57 is moved forwardly in the direction. of the arrow, Fig. 1, the arm 59 of the lever is depressed thereby causing the offset end 56 ll U thereof to engage the elbow-lever l1 and actuate the latter thereby to move the controller 22 in a direction to release the stop cam. This lever 57 is in a position where the operator can readily reach it over the top of the machine and by pulling forwardly on the lever the stop mechanism is released, and by means of this construction, this operation is accomplished with relatively little effort on the part of the operator.

After the stop mechanism has thus been released, the operator can readily turn the shaft 2 by means of the knurled handpiece 65.

The position of the lever 57 is such that it can be readily operated by the left hand of the operator so that she can release the stop mechanism with her left hand, thus having the right hand free to manipulate the knurled head 65 and turn the shaft 2 manually in order to bring the needles into the desired relative position.

I claim:

In a driving and stopping mechanism for a buttonhole sewing machine, the combination with a driving shaft having a driving pulley loosely mounted thereon and a stop cam fast thereon, a controlling member extending parallel to the shaft and movable in the direction of its length to release the stop cam and clutch the driving pulley to the shaft, a lever connected to said controlling member, automatic means for actuating said lever, and a second mafinally-controlled lever by which the first-named lever can be actuated independently of the automatic means.

In testimony whereof, I have signed my name to this specification.

JOHN KIEW l7 CZ. 

